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Two New Species of the Order Monhysterida Filipjev, 1929 (Nematoda) from the Van Uc River Mouth in Vietnam

  • BIOLOGY, MORPHOLOGY, AND SYSTEMATICS OF HYDROBIONTS
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Abstract

Two new species of free-living nematodes of the order Monhysterida have been described from bottom sediments of the Van Uc River, Vietnam. Amphimonhystrella major sp. n. resembles A. parva Gagarin, Nguyen Vu Thanh, 2009 by the structure of the spicular apparatus, but differs by a longer body, shorter tail, longer stoma, and larger spicules. Thalassomonhystera lepta sp. n. is morphologically close to T. elegans Gagarin, Nguyen Vu Thanh, 2013, but has a shorter body, smooth cuticle, tail of different shape, and larger spicules. A table of the main morphometric characters of males of the valid species of the genus Amphimonhystrella and a dichotomous key for their identification and the table of the main morphometric characters in males of seven valid species of the genus Thalassomonhystera found in water bodies of Vietnam and a dichotomous key for their identification are presented.

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ACKNOWLEDGMENTS

We thank V.A. Gusakov (Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences) for microphotographs of the new species of nematodes.

Funding

This work was carried out as part of State Task theme no. AAAA-A18-118012090105-0 (Russian Federation) and with partial financial support from grant DA-47, VAST. DA47, 12/16-19 (Vietnam).

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Authors and Affiliations

  1. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, Russia

    V. G. Gagarin

  2. Institute of Ecology and Biological Resources, Vietnam Academy of Sciences and Technology, Hanoi, Vietnam

    Nguyễn Đình Tú’

  3. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam

    Nguyễn Đình Tú’

Authors
  1. V. G. Gagarin
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  2. Nguyễn Đình Tú’
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Correspondence to V. G. Gagarin.

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Translated by D. Martynova

Abbreviations: a, ratio of body length to its maximum width; b, ratio of body length to pharynx length; c, ratio of body length to tail length; c', ratio of tail length to body width in the area of the anus or cloaca; L, body length; V, ratio of the distance from the anterior end of the body to the vulva to the body length.

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Gagarin, V.G., Tú’, N. Two New Species of the Order Monhysterida Filipjev, 1929 (Nematoda) from the Van Uc River Mouth in Vietnam. Inland Water Biol 14, 517–527 (2021). https://doi.org/10.1134/S1995082921050059

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  • DOI: https://doi.org/10.1134/S1995082921050059

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